UniprotKB/SwissProt ID: Q91VM4 (Q91VM4)
Gene Name:
Spns2
Organism: Mus musculus (Mouse)
Function: Lipid transporter that specifically mediates export of sphingosine-1-phosphate (sphing-4-enine 1-phosphate, S1P) and sphinganine-1-phosphate in the lymph, thereby playing a role in lymphocyte trafficking (PubMed:22406534, PubMed:22664872, PubMed:23103166, PubMed:23180825, PubMed:34260944). S1P is a bioactive signaling molecule that regulates many physiological processes important for the development and for the immune system (PubMed:22406534, PubMed:22664872, PubMed:23103166, PubMed:23180825, PubMed:34260944). Regulates levels of S1P and the S1P gradient that exists between the high circulating concentrations of S1P and low tissue levels that control lymphocyte trafficking (PubMed:22406534, PubMed:22664872, PubMed:23180825, PubMed:34260944). Required for the egress of T-cells from lymph nodes during an immune response by mediating S1P secretion, which generates a gradient that enables activated T-cells to access lymph (PubMed:22406534, PubMed:34260944). Also required for the egress of immature B-cells from the bone marrow (PubMed:22406534). In contrast, it does not mediate S1P release from red blood cells (PubMed:22406534, PubMed:23103166). Involved in auditory function: S1P release in the inner ear is required for maintenance of the endocochlear potential in the cochlea (PubMed:25356849). In addition to export, also able to mediate S1P import (PubMed:33785361)
Other Modifications: View all modification sites in dbPTM
Protein Subcellular Localization: Cell membrane. Endosome membrane
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